Gage

Train correlation

Test correlation

Test RMSE (1000 ac-ft)

Efficiency

Lead time (year)

Combination of indices

Weber River near Oakley

0.39

0.67

29.42

0.261

4

Dropping NAO

Chalk Creek at Coalville

0.94

0.45

13.85

0.202

4

Dropping AMO

Sevier River at Hatch

0.62

0.62

57.22

0.246

3

Dropping NAO

Muddy Creek near Emery

0.58

0.51

9.26

0.332

3

Dropping AMO

Sevier River at Hatch

0.73

0.82

47.87

0.473

2

Dropping AMO^*